set terminal pdf
set output output

set dummy u, v
set parametric
a = system("awk 'NR==1 {print $1}' ".input)
b = system("awk 'NR==2 {print $1}' ".input)
c = system("awk 'NR==3 {print $1}' ".input)

# 绘制椭球
set urange [0:pi]
set vrange [0:2*pi]

splot a*sin(u)*cos(v),b*sin(u)*sin(v),c*cos(u)